I basically need something that can do what the Supercard DSTwo Plus does in this video (see below), which is to backup save files from a GBA cartridge using the Nintendo DS/DS Lite's GBA slot. Unfortunately, the Supercard DSTwo Plus is no longer being sold on the market and there doesn't appear to be much information on what the best current (and available) alternatives are.
Would appreciate any help on this.
Would appreciate any help on this.